ESLint Custom Configuration

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ESLint Custom Configuration

To bring in the power of any ESLint capabilities that aren’t supported by default in Salesforce Code Analyzer (Code Analyzer), use your own customized .eslintrc.json. You have the flexibility to use different parsers or plug-ins, and you can define your own custom ESLint ruleset.

To invoke a customized ESLint file, pass in your config file filepath as a value to --eslintconfig flag in scanner:run command.

For example:

$ sfdx scanner:run --target "/path/to/your/target" --eslintconfig "/path/to/.eslintrc.json"

Your ESLint Custom Configuration Responsibilities

Before setting up your custom configuration with ESLint through Code Analyzer, make sure that you understand your responsibilities.

All npm dependencies, including ESLint, must be installed in the directory where you run the scanner:run command.
Your custom configuration cascades into your other project configurations as though you ran ESLint directly with the -c | –config flag. Your custom configuration must perform all necessary overrides.
Your .eslintrc.json file must be in .eslintrc format. However, there are no restrictions on the filename.
The .eslintignore flag isn’t evaluated. Instead, use the --target flag to define the targets that you want Code Analyzer to scan. --target accepts a comma-separated list of any combination of files, directories, positive patterns, and negations.
If your configuration executes Typescript, make sure that your tsconfig file is added to the configuration under parserOptions.project. The --tsconfig flag can’t be used with --eslintconfig flag.

Example:
```
  //.eslintrc.json
   "parseOptions": {
       "project": "/path/to/tsconfig.json"
   },
```
Any package.json files with embedded ESLint configuration aren’t supported.

ESlint Restrictions

ESLint usage in Code Analyzer has these restrictions.

When --eslintconfig is provided, no other default ESLint engines run in Code Analyzer.
Rule filters such as --category and --ruleset aren’t evaluated on rules selected from an ESLint custom configuration.
Engine filters can be used with --eslintconfig flag. However, only the rules included in the config execute. PMD runs with the default set of rules, but eslint-lwc isn’t invoked. Instead, ESLint is invoked based on the configuration in /path/to/.eslintrc.json.

Example:
```
  $ sfdx scanner:run --engine "pmd,eslint-lwc" --eslintconfig "/path/to/.eslintrc.json" --target "/target/path"
```

ESLint Custom Configuration

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